(n1: Person & Salaried { name: "Alice", age: 23, salary: 2000 });
(n2: Person & Salaried { name: "Bob", salary: 2500 });

// Only Person
(n3_wrong: Person { name: "Bob", salary: 2500 });

// Only Salaried
(n4_wrong: Salaried { name: "Bob", salary: 2500 });

// No Salary
(n5_wrong: Person & Salaried { name: "Bob" })

